$ git clone -n https://src.fedoraproject.org/rpms/bwbar.git /var/lib/mock/f41-build-1034399-18630/root/chroot_tmpdir/scmroot/bwbar
Cloning into '/var/lib/mock/f41-build-1034399-18630/root/chroot_tmpdir/scmroot/bwbar'...
$ git fetch origin 6c2e4c224f5d2d3081d9b1f146b3d6033eee8931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bwbar
 * [new ref]         6c2e4c224f5d2d3081d9b1f146b3d6033eee8931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c2e4c2 Eliminate use of obsolete %patchN syntax (#2283636)